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Droplet aerobreakup under the shear-induced entrainment regime using a multiscale two-fluid approach

Nykteri, G. ORCID: 0000-0002-8144-6420 and Gavaises, M. ORCID: 0000-0003-0874-8534 (2021). Droplet aerobreakup under the shear-induced entrainment regime using a multiscale two-fluid approach. Physical Review Fluids, 6(8), 084304. doi: 10.1103/physrevfluids.6.084304

Abstract

A droplet exposed to a high-speed gas flow is subject to a rapid and violent fragmentation, dominated by a widespread mist of multiscale structures that introduce significant complexities in numerical studies. The present work focuses on capturing all stages of the aerodynamic breakup of a waterlike droplet imposed by three different intensity shock waves, with Mach numbers of 1.21, 1.46, and 2.64, under the shear-induced entrainment regime. The numerical investigation is conducted within physically consistent and computationally efficient multiscale framework, using the Σ-Υ two-fluid model with dynamic local topology detection. Overall, the breakup of the deforming droplet and the subsequent dispersion of the produced mist show good agreement with available experimental studies in the literature. The major features and physical mechanisms of breakup, including the incident shock wave dynamics and the vortices development, are discussed, and verified against the experiments and the theory. While the experimental visualizations inside the dense mist are restricted by the capabilities of the diagnostic methods, the multiscale two-fluid approach provides insight into the mist dynamics and the distribution of the secondary droplets under different postshock conditions.

Publication Type: Article
Publisher Keywords: droplet aerobreakup, shock wave, secondary droplets, two-fluid model, multiscale model
Subjects: T Technology > TJ Mechanical engineering and machinery
Departments: School of Mathematics, Computer Science & Engineering > Engineering > Mechanical Engineering & Aeronautics
Date available in CRO: 31 Aug 2021 14:28
Date deposited: 31 August 2021
Date of acceptance: 27 July 2021
Date of first online publication: 17 August 2021
URI: https://openaccess.city.ac.uk/id/eprint/26683
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